The young prince of Norway is an overachiever, because gathering a huge army just to claim a little piece of land is an overachievement indeed. One can suggest that this action would improve his reputation as a decent king and a valiant war chief. Claudius’s diplomatic skill causes the present king of Norway (uncle of Fortinbras) to keep his nephew at his heel, so there will be no new war between Norway and Denmark. So, brave Fortinbras, who seemingly does know where to apply his valiance and forces, just marches through Denmark on his way to Poland. But the kingdom drops into his laps all of a sudden, for every one pretender of the Danish throne is dead; in his last soliloquy Hamlet mentions Fortinbras and proclaims him to be the best candidate for this task.
Fortinbras in the Essays